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At times, small dips or peaks may be missed by the counter, yet be visually
seen in the graph. Also, the presence of an abnormally high amount of
metallic battery noise on working POTS lines may cause the counter to
register a high false number of loads, but the actual number may be
visually determined by looking at the graph.
b) Press B(
TDR
accurate distance to the first coil to be measured.
c) Press C(
VF Long. Balance
presence of half-loads.
d) If a "Resistive Fault" message appears, press D (
measure the value of the fault.
Loop Devices Test
The Loop Devices test detects the presence of the following devices:
•
Loop treatment devices on working POTS pairs such as Loop Extenders
and Range Extenders with Gain (REGs).
•
Fault-sectionalizing devices, such as Maintenance Termination Units
(MTUs) and Network Interface Devices (NIDs).
•
Mechanical Bell Ringers (C4 and C5).
Setting Up a Loop Devices Test
The Loop Devices test has no test-specific setups.
POTS Testing and Fault Location
) to go directly to the TDR menu, which allows a more
) to check for possible mis-loading due to the
The POTS Toolbox
Note
Shorts & Grounds
4
) to
4-37
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